Maintaining diplomatic relations is a necessary foreign policy for the US and other nations. Speaking with Taliban leadership isn't the same as legitimizing the new regime, and it's only through conversations between the regime and Western governments that respect for human rights can ultimately be restored.
The Taliban has little interest in following through with their diplomatic promises to the US. The recent killing of Ayman al-Zawahiri in July reveals this, as Afghanistan was used as a base for transnational terrorism. How can the US have any hope for negotiations if fundamental commitments are ignored?
There's a 25% chance that the United States will recognize the Islamic Emirate of Afghanistan before 2030, according to the Metaculus prediction community.